/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.dromara.streamquery.stream.core.lambda.function;

import org.dromara.streamquery.stream.core.lambda.LambdaInvokeException;

import java.io.Serializable;
import java.util.function.Function;
import java.util.function.UnaryOperator;

/**
 * 可序列化的UnaryOperator
 *
 * @param <T> the type of the input and output of the operator
 * @author VampireAchao Cizai_
 * @see java.util.function.UnaryOperator
 */
@FunctionalInterface
public interface SerUnOp<T> extends UnaryOperator<T>, Serializable {

  /**
   * Applies this function to the given argument.
   *
   * @param t the function argument
   * @return the function result
   * @throws java.lang.Exception if any.
   */
  @SuppressWarnings("all")
  T applying(T t) throws Throwable;

  /** Applies this function to the given argument. */
  @Override
  default T apply(T t) {
    try {
      return applying(t);
    } catch (Throwable e) {
      throw new LambdaInvokeException(e);
    }
  }

  /**
   * Returns a unary operator that always returns its input argument.
   *
   * @param <T> the type of the input and output of the operator
   * @return a unary operator that always returns its input argument
   */
  static <T> SerUnOp<T> identity() {
    return t -> t;
  }

  /**
   * casting identity
   *
   * @param function source function
   * @param <T> param type
   * @param <R> result type
   * @param <F> a F class
   * @return identity after casting
   */
  @SuppressWarnings("unchecked")
  static <T, R, F extends Function<T, R>> SerUnOp<T> casting(F function) {
    return t -> (T) function.apply(t);
  }
}
